Nunchuck Throttle calibration?

ESK8 Electronics
1

Hey all, just built a remote based off of this: https://github.com/RollingGecko/ArduBoardControler and FocBox. Everything seems to be working fairly well except for the throttle input. In BLDC->App Configuration->Nunchuck display on and joystick at resting position it is at 32% and at full throttle it is at 66%, so there is always resistance on the motor in the “home” position. I have tried playing with the ERPM limit start, ERPM limit start and deadband but does not seem to change anything. How do I adjust this?

2

Are you using the BLDC_Tool or the VESC_Tool

3

I am using the BLDC Tool, I did not know there was a VESC Tool. I will try it out, thanks!

4

You have to send the data the right way, 0 is full brake and 254 is full throttle

If you are reading from a analog potentiometer jus use rempack.YJoy = map(analogRead(Pin), 0, 1023, 0, 254) and you are good

5

Thanks @Pedrodemio , I did have the analog read set to rempack.YJoy = map(analogRead(Pin), 0, 1023, 0, 254), but I think the analog input from my joystick is a little off. I had to massage the 1023 down to about 720 and seems to be working well. Not sure if this is the correct way of adjusting this but it seems to do the trick.

6

That’s ok too, mine goes to 98% but I didn’t bother

7

Just a heads up: when using VESC tool you will probably upgrade to the new 3.xx Vesc firmware, however we found out that the whole Nunchuck aspect doesn’t work with that right now (problem of the library I guess). So if you’re not using FOC I’d suggest staying with firmware 2.xx or modifying ArduBoardControl to use PPM.

8

It’s working on 3.33 and 3.34 but not with the library on rolling gecko github, @Pimousse made a modified version that’s work, I think he submitted the changes

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9

Ooh alright I wasn’t completely up to date on that, thanks!

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10

Actually, I took the old library (working with FW2.18) and adjusted the command and values structures and deserialization to match 3.xx firmware. I didn’t change anything else. So basically, that means that there were no differences on the nunchuck side.

If you’re interested, I plan to add COMM_GET_MCCONF in order to set the min scale of the battery gauge exactly to the cutoff set on the VESC.

1 Like
11

Thanks for the heads up, I am using the FocBox at 2.18, I was hesitant because I read that there may be some problems with updating the FocBox to the newest firmware and using the VESC Tool. I am new to the forum, are there some threads I should be keeping an eye on for the nunchuck changes?